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The central cavity from the (alpha/alpha)6 barrel structure of Anabaena sp. CH1 N-acetyl-D-glucosamine 2-epimerase contains two key histidine residues for reversible conversion.

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N-acetyl-D-glucosamine 2-epimerase (GlcNAc 2-epimerase) catalyzes the reversible epimerization between N-acetyl-D-glucosamine (GlcNAc) and N-acetyl-D-mannosamine (ManNAc). We report here the 2.0 A resolution crystal structure of the GlcNAc 2-epimerase from Anabaena sp. CH1. The structure

Lectin binding to normal mucosa, leukoplakia and squamous cell carcinoma of the oral cavity.

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A panel of fifteen biotinylated lectins was used to study the saccharides associated with the epithelial component of normal and leukoplakic mucosa and squamous cell carcinoma, from a variety of locations in the oral cavity. Lectin binding heterogeneity was found between various sites of normal

Trimodal Control of Ion-Transport Activity on Cyclo-oligo-(1→6)-β-D-glucosamine-Based Artificial Ion-Transport Systems.

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Cyclo-oligo-(1→6)-β-D-glucosamines functionalized with hydrophobic tails are reported as a new class of transmembrane ion-transport system. These macrocycles with hydrophilic cavities were introduced as an alternative to cyclodextrins, which are supramolecular systems with hydrophobic cavities. The

Ultra-sonication Assisted Synthesis of D-Glucosamine Based β-CD Inclusion complex and Its Application as an Aqueous Heterogeneous Organocatalytic System

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For the first time, inclusion has been crafted between a carbohydrate based molecule and β-CD hydrophobic cavity for the asymmetric catalytic applications. This novel D-glucosamine based inclusion compound has been synthesized in high yields using innovative and proficient acoustic cavitation

Antistreptococcal group A antibodies: production after in vitro activation and hybridization of mouse spleen cells.

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Streptococcal group A polysaccharide-specific antibodies were raised by the method of somatic cell hybridization. Spleen cells of experimentally unprimed BALB/c and C57BL/6 mice were activated in vitro by the streptococcal vaccine and fused with the Sp2/0-Ag14 line at times o, 35, 70, and 105 h

Lectin-conjugated PEG-PLA nanoparticles: preparation and brain delivery after intranasal administration.

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In order to improve the absorption of nanoparticles in the brain following nasal administration, a novel protocol to conjugate biorecognitive ligands-lectins to the surface of poly (ethylene glycol)-poly (lactic acid) (PEG-PLA) nanoparticles was established in the study. Wheat germ agglutinin (WGA),

Biodegradable Chitosan Decreases the Immune Response to Trichinella spiralis in Mice.

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The purpose of this study was to evaluate the potential of chitosan units released during natural degradation of the polymer to activate the immune system against T. spiralis infection. High molecular weight chitosan was injected intraperitoneally into C57BL/6 mice. Flow cytometry and cytokine

Glycoconjugate sugar residues in the chick embryo developing lung: a lectin histochemical study.

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A lectin histochemical study was performed to investigate the distribution and changes of the oligosaccharidic component of the glycoconjugates in the lung of chick embryos, of 1-day-old chick, and of the adult animal. For this purpose, a battery of seven horseradish peroxidase-conjugated lectins

Analysis of the secretions of the subcommissural organs of several vertebrate species by use of fluorescent lectins.

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The glycoprotein secretions of the subcommissural organ were analyzed with the use of nine fluorescent lectins, specific to different sugar moieties. After exposure to Concanavalin A a bright fluorescence was observed in the ependymal cells of the subcommissural organs of all vertebrates studied

Effects of the deglycosylation on the structure and activity of chloroperoxidase: Molecular dynamics simulation approach.

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Chloroperoxidase (CPO) is a versatile fungal heme-thiolate protein that catalyzes a variety of one electron and two-electron oxidations. Chloroperoxidase is a versatile fungal heme-thiolate protein that catalyzes a variety of oxidations. CPO enzyme contains thirteen sugars, including five N-acetyl

Cucurbit[7]uril: a high-affinity host for encapsulation of amino saccharides and supramolecular stabilization of their α-anomers in water.

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Cucurbit[7]uril (CB[7]), an uncharged and water-soluble macrocyclic host, binds protonated amino saccharides (D-glucosamine, D-galactosamine, D-mannosamine and 6-amino-6-deoxy-D-glucose) with excellent affinity (Ka =10(3) to 10(4) M(-1) ). The host-guest complexation was confirmed by NMR

Determination of the glycosylation-pattern of the middle ear mucosa in guinea pigs.

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In the present study the glycosylation pattern of the middle ear mucosa (MEM) of guinea pigs, an approved model for middle ear research, was characterized with the purpose to identify bioadhesive ligands which might prolong the contact time of drug delivery systems with the middle ear mucosa (MEM).

[Lectin histochemical study on human dental pulp. Special reference to odontoblasts and pulp cells].

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The present study investigated some lectin affinities of human dental pulps, especially of odontoblasts and pulp cells. The materials were obtained from clinically intact teeth that were caries-free, attrition and/or abrasion-free. Mucopolysaccharide staining was carried out with applied PAS and

Hyaluronan synthesis and degradation in cartilage and bone.

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Hyaluronan (HA) is a large but simple glycosaminoglycan composed of repeating D-glucuronic acid, beta1-3 linked to N-acetyl-D-glucosamine beta1-4, found in body fluids and tissues, in both intra- and extracellular compartments. Despite its structural simplicity, HA has diverse functions in skeletal

[Development of slow releasing anticancer drug based with absorbable biomaterial chitin].

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To have a comparatively more slowly releasing anticancer drug with effectiveness, Plachitin was prepared by chemical combination of CDDP and chitin (poly-N-acetyl-D-glucosamine). Chitin is absorbed by the living body over several months. To investigate the slow releasing property, it was implanted

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